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Electrowetting diminishes contact line friction in molecular wetting
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0001-9160-2549
KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-7498-7763
2020 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 5, no 6, article id 064203Article in journal (Refereed) Published
Abstract [en]

We use large-scale molecular dynamics to study the dynamics at the three-phase contact line in electrowetting of water and electrolytes on no-slip substrates. Under the applied electrostatic potential the line friction at the contact line is diminished. The effect is consistent for droplets of different sizes as well as for both pure water and electrolyte solution droplets. We analyze the electric field at the contact line to show how it assists ions and dipolar molecules to advance the contact line. Without an electric field, the interaction between a substrate and a liquid has a very short range, mostly affecting the bottom, immobilized layer of liquid molecules which leads to high friction since mobile molecules are not pulled towards the surface. In electrowetting, the electric field attracts charged and polar molecules over a longer range, which diminishes the friction.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2020. Vol. 5, no 6, article id 064203
National Category
Biophysics
Identifiers
URN: urn:nbn:se:kth:diva-278603DOI: 10.1103/PhysRevFluids.5.064203ISI: 000543942500003Scopus ID: 2-s2.0-85087963862OAI: oai:DiVA.org:kth-278603DiVA, id: diva2:1455884
Note

QC 20200729

Available from: 2020-07-29 Created: 2020-07-29 Last updated: 2022-06-26Bibliographically approved

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Johansson, PetterHess, Berk

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